Method of making bas-reliefs



Dec. 28 192s. 1,612,001

J. DIEFENBACH METHOD OF MAKING BAS-RELIEFS Filed May 17. 1926 IN vs TOF? 7 1005 IEFE/VBACH. 3 W J 2 Patented Dec. 28, 1926.

TENT

if A0013 DIEFENBACH, F LONG BEACH, CALIFORNIA.

METHOD OF MAKING BAS-RELIEFS.

Application filed May 17, 1926.

My invention relates to improvements in methods of making has-reliefs and the object of the invention is to devise means adapted to be applied to the surface of stone, metal,

glass, etc., so that said surface maybe submitted to the action of a sand-blast in such a manner as to produce a has-relief of any desired design whether simple or intricate.

' A further and particular object of the invention is to obviate the necessity of subjecting the surface to be treated to lightrays as has been necessary in similar processes used heretofore, thus enabling my process to be used upon the surfaces of large pieces of stone, etc., such as are used in monumental and similar work.

, My invention consists of an improved method of making has-reliefs all as hereinafter more particularly described and illustrated in the accompanying drawing in which:

Fig. 1 is a perspective view of a fragmentary portion of a piece of paper or other similar material which iscoated upon one side with a sensitized paste and upon the other side with an adhesive solution.

Fig. 2 is a similar view to Figure 1 show ing a portion of a stencil positioned upon the sensitized side of the paper.

Fig. 3 is a front elevational view of the fragmentary portion of paper shown in Figure 1 after the sensitized side of such paper has been subjected to actinic rays through the stencil, the stencil being removed.

Fig. 4 is a sectional view through the line ti Figure 3 the paper being shown positioned upon the surface of a fragmentary portion of material such as stone.

Fig. 5 is a similar view to Figure 4 showing the assemblage after it has been subjected to the action of a sand-blast, and,

Fig. 6 is a perspective view of a fragmentary portion of the stone showing a portion of the completed bas-relief thereon.

Like characters of reference indicate corresponding parts in the different views.

In carrying out my improved method a sheet of material 1 such as blotting paper is coated upon one side with a sensitized paste 2 which is quickly soluble in water, and is adapted to be rendered practically insoluble Serial No. 109,757.

in water by the action of light. The other side of the material is coated with an adhesive solution 3. When it is desired to reproduce upon a surface any particular design a stencil or pattern 4 of light-transmit ting material is placed upon the sensitized side 2 of the paper, the assembly then being subjected to light-rays either solar or artificial, the light-rays passing through the open portions of the stencil or the transparent portions of the pattern and acting upon and hardening the exposed portions of the paste 2. The stencil is now removed and the coated paper submerged in a'cold water bath, and as the portions of the solution which were not exposed to the light-rays are solubl they will be washed off leaving 1 the light-hardened or insoluble portion of the solution upon the paper. The paper is then removed from the bath and dried in the usual manner as practiced by photographers. If it is found that the bath washes away the adhesive solution 3 upon the other side of the paper, the application of such solution can of course be deferred ,until the paper is removed from the bath and dried. It will be appreciated that the light-hardened portions of the solution left upon the paper are of the same design as the open portions of the stenciLthe pattern formed of the hardened portions of the solution remaining thereon as illustrated in Figure 3.

When it is desired to cut that particular pattern upon any surface it is only necessary to wet the adhesive solution 3 upon the other side of the paper and paste the paper upon such surface. lVhen the adhesive solution is thoroughly dry and the paper firmly fixed in position the cutting process may then be commenced. This is achieved by a sand-blast which is directed upon the face of thepaper in the direction illustrated by the arrow in Figure 4, the sand-blast quickly cutting awaythe portions of the paper unprotected by the hardened solution and coming in contact with the surface of the object which is to be out, such surface being in turn out into by the sand-blast as illustrated in Figure 5 thus forming the same design as that of the hardened. solutioncovered portion of the paper. It will be Hit! 7 understood that this light-hardened solution must be of suflicient hardness to withstand the sand-blast. It has been found that a solution composed of live bercent of potassium bichromate, four percent of glycerin, forty 'percent of glue and fifty-one percent of water makes an admirable compound for this purpose.

After the application of the sand-blast it is of course necessary to remove the pop tions of paper protected by the hardened solution, this may be done by'one of several methods such as thoroughly Wetting it with hot water containing potash whichis a solvent for the hardened solution.

I am aware that a sensitized solution and s'and-blast'method has been used for inscribing designs and names upon .plategiass and also has been used for cutting cameos upon cameo glass but it'has always been necessary to apply the sensitized solution directlv'upon the surface to be out which necessitates the placingof such surface in a darkroom prior to its exposure to light through a stencil. My method is particularly designed for use in cut-ting surfaces of large objects which through their bulk cannot be conveniently transported to a darkened room, and furthermore by my process a number of designs can be made from the one stencil as it is only necessary to place the stencil on the sensitized side of the paper, expose the assembly to the light and after exposure return itto a darkroom where the stencil can be removed and the paper immersed in a cold water bath'as before described. 7

This process has been found particularly adaptable for monumental work where the paper upon which the pattern is outlined in hard solution canbe stuck upon the surface of the stone by means of the'adhesive paste 3 andthe sand-blast applied. Furthermore by applying the sensitized solution upon sheets of paper instead of directly upon the surface to be cut it 'willbe appreciated that I V have devised means for very substantially reducing the cost of this process as any desired pattern may be printed upon a sheet ofsensitiz ed paper and such paper forwarded to any required destination.

As the stencil is made directly uponthe sensitized side of the paper-it will be seen that an extremely sharp outline will be achieved as there is no'possibility of the actinic rays beingdefiected or shadows being cast and furthermore as the paper is comparatively thin the sand-blast will in turn cut a clear pattern upon the surface to which the paper is afiixed.

lVhat I claim as my invention is:

l. The herein described method of making has-reliefs comprising the application of a sensitized solution upon a sheet of material,

placing a pattern having transparent and opaque portions upon the sensitized coating of the sheet of material, directing actinic rays upon said coating through the pattern, removing the portions of the coating to which the rays have not penetrated, positioning said sheet of material upon the object upon which it is desired to form a has-relief and eroding by a sand-blast the portions of said surfaces which are not covered by the sensitized coated portions of the material.

2. The herein described method of making has-reliefs comprising the application of a sensitized solution upon a sheet of flexible material, placing a pattern having transparent and opaque portions upon the'sensitized coating of the sheet of material, directing actinic rays upon said coating through the pattern, removing the portions of the coating to which the rays have not penetrated, positioning said sheet of material upon the object upon which it is desired to form a has-relief and eroding by a sandblast the portions of said'surfaces which are not covered by the sensitized coated portions of the material. I

8. The herein d-escribed'method of making has-reliefs comprising the application of a sensitized'coating upon a sheet of material, positioning a pattern having transparent'and opaque portions upon the sensitized coating of the sheet of material, directing actinic rays through the pattern onto said coating,

removing the pattern from the sensitized coating, immersing the material in a bath to remove the portions'of'the coating to which the rays have not penetrated, drying said material and positioning it uponthe surface of the object upon which it is desired to form a has-relief, and eroding by a sandblast the portions of said surfaces which are not covered by the sensitized coated portions of the material.

4. The herein described method of making has-reliefs comprising the application of a sensitized coating to one side of a "flexile sheet of material, applying an ahesive solution to the other side ofthe material, placing a pattern having transparent and opaque portions upon the sensitized coating of the sheet of material, directing actinicrays upon said coating through the pattern, removing the portions of the coating to which the rays have not penetrated, adhering the adhesive solution-covered side of the material to the surface of the object upon which it is desired to form a basa'elief, and eroding by a sand-blast the portions of said surfaces which are not covered by the -sensitized coated portions of the material.

5. The herein described method of making has-reliefs 'coi'nprising the application of a sensitized coating to the material, positioning a pattern having transparent and opaque portions upon the sensitized coating of the sheet of material, directing actinic rays.v

through the pattern onto said coating, removing the pattern from the sensitized coating, immersing the material in a bath to re- 5 move the portions of the coating to which the rays have not penetrated, adhering the adhesive solution-covered side of the mate rial to the surface of the object upon which it is desired to form a has-relief and eroding by a sand-blast the portions of said surfaces Which are not covered by the sensitized coated portions of the material.

' JACOB DIEFENBACH. 

